Brake-block.



BRAKE BLOCK. AIPPLIOATION FILED FEB. 15,

UNITED s'rA Es PATENT OFFICE.

' WALTER O. BLAIR AN MARCELLUS J. SOANI IAN, OF KEYSTONE, SOUTH DAKOTA.

BRAKE-BLOCK.

Specification of Letters Patent.

Patented Nov. 12, 1907.

To all whom it may concern:

Be it'known that we, WALTER O. BLAI R and h iAR- CELL-US J, SCANLAN,citizens of the United-States, residing at Keystone in the county ofPennington and State of South Dakota, have invented certain new anduseful Improvements in Brakedlloclts, of which the following is aspecification.

This invention relates to new and useful improvements in' brake blocksand has particular reference to a. block comprising a casting andfriction shoes of suitable material h'eld therein for engagement withthe periphery of the wheel. 1

The invention aims primarily to provide a casting including in itsconstruction, novel means for detachably securing the same upon thebrake beam and novel means for holding the above mentioned frictionshoes in detachable relation, whereby. when worn they may be reversed orreplaced by new ones at will.

- The invention aims as a further object to provide a device of theabove type in which accidental displacement of the shoes from the holderin the course of use shall be prevented, and. in which ready access maybe had to said shoes to remove the same, manually or with tive view of aholder with the blocks forming the friction shoe as an entirety detached.therefrom. Fig. 3 f is a detailed perspective view taken from the rearof a modified embodiment of the invention, and Fig. 4

' 2 the blocks constituting as an entirety the friction shoe forengagement with the wheel and received within the holder 1. Said holderis preferably cast from an integrai section of metal and is of areshaped curvature to litiniorm to the curvature of the vehicle wheel. Asclearly shown in Fig. 2 the, holder 1 adjacent its concaved face isformed with a gripping flange 3 of substantial U shape and extendingalong the sides and bottom thereof so as to afford at the base of theblock a stop 5 for preventing the downward displacement of the blocks 2and at the top of the holder an 'i ipen space 6 for the introduction ofsaid blocks betw en the side flanges 3. Throughout its length the flange3 has its inner suriace beveled or undercut as at 4, whereby a ter isillustrated in Fig. 1 in which it will be noticed that in cross sect-ioneach of the blocks 2 is of hourglass shape, being of constricted widthat their central portions as at S and having its ends convergingoutwardly on each side of said constricted central portion as at 9 toafford tw'o substantially dovetailed projections at either end, eitherone of which may be engaged in the holder 1.

In the embodiment of the invention illustrated in Fig. 4, the. blocks 2are not reversible as in the previous instance. but are formed with asingle dovetailed projection 9 and with a substantiallyrectangulareugagiug portion 7.

The holder 1 also embodies means for engagement with the brake beam, apreferred embodiment of which is i lustrated in Fig. 1 and analternative embodiment in Fig. 3. In Figs. 1 and 2 it will be noted thatthe embodiment of fastening means disclosed, comprises rearwardlyextending spaced parallel flanges 1] cast upon the rear face of theblock 1 and affording a suitably shaped recess for the receptiontherethrough of the brake beam A. Said brake beam carries on its uppersurface a fixed brace a which at its upper end carries a pin b forengagement in any selected one of a series of apertures c, the latterbeing provided with a longitudinal central rib 13 arranged on the rearface of the holder 1 above the upper flange 11. A similar rib 14 isprovided adjacent the lower rib l I. In the disposition of the partsdescribed the beam is positively held in its position between theflanges 11 by one or more bolts 15 extending tl'ierethrough and throughthe holder 1. r In Fig. 3, instead of the flanges 11. said holder iscast with a wedge shaped lug 10 upon its rear face, the lug 10 beingdesigned for reception in a conformable reccssprovided therefor in thebrake beam, and being further designed to receive a bolt therethrough bywhich said holder may be securely locked to the beam.

For the purpose of reducing the cost of manufacture and of providing alighter structure, it is preferred to provide the body of the holder 1with a series of elongated openings 12. The openings 12 also affordmeans for permitting the insertion of a tool through the holder tofacilitate the assemblage of the blocks 2.

For heavy work it is desirable that the blocks 2 be positively heldwithin the holder 1 A fastening pin 16 is accordingly passedtransversely through the side flanges 3 at the upper end of the holderand through the uppermost block 2. The pin 16 is held from displacementby a cotter l7. v

It will be readil y apparent that the blocks 2 may be of any. materialcapable of an etlicacioue grip upon the as advantageously used.

It will be' apparent that the ribs 13 and 14 effectively reinforce theholder 1. In the form of the invention illustrated in Fig. 1, the bracea materially aids in sustaining the holder in an upright position.

While the elements herein shown and described are well adapted to servethe functions set forth, it is obvious that various minor changes may bemade in the proportions, shape and arrangement of the several partswithout departing-from the spirit and scope of the invention as definedin the appended claims.

Havingiully described my invention I claim:

1. A holder for brake blocks adapted to carry triction shoes upon itsfront face and having its rear face provided intermediate its ends withan enlarged integral section adapted for attachment to a brake beam,reinforcing ribs extending centrally and longitudinally from saidsection to the ends of the holder. said holder havingopenings formedtherethroug'h on both sides of said ribs.

2. A holder for brake blocks adapted to carry friction shoes upon itsfront face and having its rear face provided intermediate its ends withan enlarged section comprising. spaced integral flanges adapted forattachment to a brake beam, reinforcing ribs extending centrally andlongitudinally from said section to the ends of the holder, said holderhaving openings formed therethrough on both sides of said ribs.

3. A holder for brake blocks adapted to carry friction s hoes upon itsfront face and having its rear face provided with a brake beam attachingsection and central longitudinal reinforcing ribs extending therefrom,one of said ribs being provided with transverse openings, a braceattachable to the brake beam and provided with openings at one endadapted to be alined with one of said openings in said rib, and aremovable pin adapted for insertion to lock the same.

4 A device of the character described comprising a holder having a frontface formed with a dovetailed recess open at one end for the receptionof a conformable frictlon shoe, and having a rear face providedintermediate its ends with an enlarged integral section adapted forattachment to a brake beam, reinforcing ribs extending centrally andlongitudinally from said section to the ends of the holder, said holderhaving openings formed therethrough on both sides of said ribs.

In testimony whereof we afiix our signature in presence of twowitnesses.

WALTER O. BLAIR. MARCELLUS J. SCANLAN.

v Witnesses Emma CAPLE, JAS. HALLEY, Jr.

